Table 3 Difference in measured and predicted V̇O2peak values by multiple equations in the validation cohort were stratified by sex, age groups, and BMI categories.

From: A reference equation for peak oxygen uptake for cycle ergometry in Chinese adult participants

Variables

PUTH equation (mL·min−1)

Xiangya equation (mL·min−1)

Wasserman equation (mL·min−1)

FRIEND equation (mL·min−1)

p value

Total (N = 4624)

37.0 ± 349.7

209.6 ± 367.0***

−456.5 ± 426.5***

−739.7 ± 487.6***

 < 0.001

Sex groups

 Men (N = 2244)

50.1 ± 432.9

284.9 ± 448.8***

−645.0 ± 474.9***

−1021.8 ± 477.9***

 < 0.001

 Women (N = 2380)

24.6 ± 246.3

138.6 ± 248.0***

−278.6 ± 275.0***

−473.7 ± 317.8***

 < 0.001

Age groups (yrs)

 18–29 (N = 675)

−18.8 ± 406.5

246.0 ± 444.0***

−762.9 ± 464.8***

−1084.6 ± 483.4***

 < 0.001

 30–39 (N = 940)

29.7 ± 389.8

247.5 ± 403.3***

−609.9 ± 443.5***

−930.8 ± 487.2***

 < 0.001

 40–49 (N = 1081)

83.9 ± 358.6

258.1 ± 370.7***

−425.6 ± 395.9***

−724.3 ± 442.3***

 < 0.001

 50–59 (N = 1004)

58.7 ± 331.6

195.0 ± 338.4***

−326.1 ± 362.8***

−591.8 ± 423.7***

 < 0.001

 60–69 (N = 677)

16.7 ± 253.5

123.2 ± 255.2***

−269.2 ± 275.3***

−501.0 ± 359.6***

 < 0.001

 70–79 (N = 230)

−22.6 ± 230.1

52.9 ± 238.0*

−216.2 ± 261.7***

−391.8 ± 381.7***

 < 0.001

 80–89 (N = 17)

2.6 ± 189.5

0.5 ± 173.2

−172.6 ± 170.8*

−398.2 ± 317.3***

 < 0.001

BMI categories (kg·m−2)

  < 18.5 (N = 142)

1.8 ± 283.7

101.3 ± 291.4*

−529.6 ± 341.0***

−702.1 ± 345.1***

 < 0.001

 18.5–23.9 (N = 2063)

45.3 ± 341.9

227.3 ± 356.1***

−417.3 ± 403.9***

−686.5 ± 446.3***

 < 0.001

 24–27.9 (N = 1675)

39.6 ± 359.1

231.5 ± 378.2***

−461.2 ± 435.1***

−770.7 ± 498.4***

 < 0.001

  ≥ 28 (N = 744)

14.6 ± 360.5

131.6 ± 370.9***

−540.2 ± 467.1***

−824.5 ± 571.8***

 < 0.001

  1. Data are presented as arithmetic mean ± SD.
  2. BMI body mass index, FRIEND fitness and the importance of exercise: a national data base, PUTH Peking University Third Hospital, RER respiratory exchange rate, V̇O2peak peak oxygen uptake.
  3. *Significantly different vs. PUTH equation, *p < 0.05, **p < 0.01, ***p < 0.001.
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